Blau is the German and Catalan word for the color blue. It may refer to: Places Blau (Danube), a tributary of the Danube river in Germany Blau Monuments, pair of inscribed stone objects from Mesopota
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b3974b265000662a89428cf1414737eab925781afc538c16dfae8f99f09c09. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/121185a6-208a-492d-9e7b-d0dcb691ebaf.json and https://artists.proofprofile.net/proofs/artist/121185a6-208a-492d-9e7b-d0dcb691ebaf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eda638a613c532f02c14a9ddc45ae0b728f5ffdb6e676e49c41ec4557ff12e5. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ8A2405330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3affa212910212eeef51c32ebce970a80292a6fb1b755ca86ad46f07f4a12d05. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ8A2405341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5ea5ea6abd73c37f4a2bd048cf66d5cc1969634f344cc39bb5bded3f25c06f. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZEB2420160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe956667e7ca1ef4881dbd8bf3fef5727368771a51f73a075f06bd4aa5cbf52a7. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTV32572084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d31ca29003bdfd67d7d6422546d6e359e92123f57cb199d4f9a5e82ac13bfc. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2565989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5ea5ea6abd73c37f4a2bd048cf66d5cc1969634f344cc39bb5bded3f25c06f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZEB2420160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7102566182e679f45b372f915d9f997343087dc7ccac9b29b1a6874e87a4544. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2565992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd4d9a90d87a372a0b4f6ab277d00b1be751bb1f1dd4d170a24129d6bdd49d4. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2565993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68dfb169bdf9b234019215f06ca9206805ef157bb206b6a6974ab381dd9a4cb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2565994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bf9dfb06161860b4b1b990712c95ef97551a6a25729fb43880ebef4ede5463. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2565995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2df3dd91679146f0d069a39602bc2ca6e278ac166a23daa03fe2d6060138a0e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2565997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6682ffb83411167028bc7ea2f7e9e9ceb3f05fb48554afed7d011f5c9b4c59b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2565998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3affa212910212eeef51c32ebce970a80292a6fb1b755ca86ad46f07f4a12d05. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ8A2405341.